CN102444142B - Pile group column replacement expanded basement and construction method of same - Google Patents
Pile group column replacement expanded basement and construction method of same Download PDFInfo
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- CN102444142B CN102444142B CN201110279564.XA CN201110279564A CN102444142B CN 102444142 B CN102444142 B CN 102444142B CN 201110279564 A CN201110279564 A CN 201110279564A CN 102444142 B CN102444142 B CN 102444142B
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Abstract
The invention belongs to the technical field of building construction, and particularly discloses a pile group column replacement expanded basement and a construction method of the same. The pile group column replacement expanded basement is used for additionally building a storey of basement below the existing building by reasonably utilizing the underground space without increasing the area of the building on the ground. The pile group column replacement expanded basement includes a basement base plate and bored concrete piles fixedly connected with the basement base plate, wherein a bearing platform is arranged at the top of the bored concrete piles in a matched way, annular ground beams and fender piers are arranged on the circumferences of the bottom parts of the bored concrete piles, and a top plate (1) of the basement fixedly arranged between the bored concrete piles is poured to form a wall body. By adopting the technology, the construction method of the pile group column replacement expanded basement in the earthquake non-resistive area has excellent effects in time limit for the project and the cost, the construction time limit is greatly shortened, another storey of the basement can be added without the need of demolishing the original building, and the costs for demolishing the upper layer building and rebuilding are saved.
Description
Technical field
The invention belongs to technical field of building construction, be specifically related to a kind of clump of piles for the underground space that rationally utilizes and change post enlarging basement and construction thereof.
Background technology
Along with increasing of population, land area is become nervous gradually, particularly in metropolis, floor space is little, therefore space is inadequate, designs in the situation that a kind of building area on the ground do not increase, and rationally utilizes the underground space, meet that country advocates save land, material-saving, energy-conservation overall situation, become one of problem to be solved.
Summary of the invention
For the above-mentioned problems in the prior art, the object of the present invention is to provide a kind of clump of piles for the underground space that rationally utilizes to change post enlarging basement and construction thereof.
A described a kind of clump of piles changes post enlarging basement, it is characterized in that described basement comprises basement bottom board, the castinplace pile being fixedly connected with basement bottom board, described castinplace pile top is equipped with cushion cap, castinplace pile bottom periphery is equipped with annular grade beam and fender pier, and described basement roof is fixedly installed on and between the castinplace pile described in cushion cap, builds formation body of wall.
A described a kind of clump of piles changes post enlarging basement, it is characterized in that described castinplace pile outside is equipped with pile body back-up coat.
A described a kind of clump of piles changes the construction of post enlarging basement, it is characterized in that described construction comprises the following steps:
1) soil excavation and slope retaining: according to constructure scheme requirement, when basement area is larger, carry out blockette shoveling, after the basement bottom board of the first block has been built, after the stability at the bottom of making is guaranteed, the earthwork that can excavate the second block;
2) castinplace pile removing surface finishing: after soil excavation, the evagination concrete on pile body surface, honeycomb and loosening concrete are carried out to artificial chisel and remove, design and code requirement trim the diameter of pile body, verticality;
3) castinplace pile and the bar planting of cushion cap surface chemistry, by following technological process, carry out chemically-planted steel bar:
Unwrapping wire is located → is holed →Qing hole → reinforcing bar and processes → join glue, perfusion bar planting agent → insertion reinforcing bar → adjustment → curing conservation → detection;
4) basement bottom board bed course is built: with concreting one deck basement bottom board bed course, the C10 concrete bed course that its thickness is 100mm;
5) building of basement bottom board: the good baseplate reinforcing bar of first colligation, then build underplate concrete;
6) reinforcing of castinplace pile pile body, adds one deck pile body back-up coat at the external surface of castinplace pile;
7) basement wall body construction: be connected and fixed by designing requirement outer wall of basement reinforcing bar and grout pile bar planting with it, the bar planting of vertical Zhu Jin top and original cushion cap bottom overlaps colligation and fixes, the annular bar planting of vertical Zhu Jin bottom and pile foundation is connected and fixed, outer wall of basement is filled out embedding with the surperficial junction of stake with sponge, reduce the spillage at this position, then carry out watering of walls concrete and smash;
8) basement roof construction: be positioned on former cushion cap surface by the newly-increased beam in drawing part basement top, pillar surrounding above former cushion cap is set up collar tie beam, the newly-increased beam in another part basement top and former cushion cap or former beam, post join, method by chemically-planted steel bar is connected, new-old concrete interface carries out dabbing processing, obtains a clump of piles and changes post enlarging basement.
A described a kind of clump of piles changes the construction of post enlarging basement, it is characterized in that the sequence of excavation described in step 1) is: first indoor rear outdoor, by the parallel propelling of a side direction opposite side, before excavation, original building place opens two above muck haulage passages, adopt little digging machine shoveling, entrucking, small agricultural vehicle is transported to mound field, building west side, high with forklift heap, be transported to outdoor rear large forklift or large digging machine dress soil, with the direct outer spoil ground that is transported to of dump truck, after treating that indoor soil excavation is good, outdoor section is directly with large digging machine shoveling dump truck outward transport; Little digging machine and artificial clear soil for 50cm is stayed on shoveling Zhi Liang Bian,Zhu Bian,Zhuan limit and other inhering architecture limits.
A described a kind of clump of piles changes the construction of post enlarging basement, it is characterized in that the chemically-planted steel bar technological process described in step 3) is as follows:
A. unwrapping wire is located: according to design drawing, require to emit bar planting position line at pile body and cushion cap surface, position, hole unwrapping wire will be dodged main muscle in original structure, in order to avoid injury of primary structure reinforcing bars, unwrapping wire will accurately require construction according to design drawing;
B. boring: hole is got to the degree of depth of designing requirement with hand electric drill or platform drill on the position of indicating, reinforcing bar implantation depth is generally 23d-25d, and described d is by being planted bar diameter;
C.Qing hole: the powder to the inside, hole is removed;
D. reinforcing bar is processed: the greasy dirt of anchorage length of steel bar scope is clean by solvent clean, until expose the new face of reinforcing bar, after handling, according to different-diameter, length, unified stacking is standby;
E. pour into bar planting clay: use PVC plastic pipe or conduit by clay ingress pipe, and send in hole, then with another bar, clay in pipe is squeezed in eyelet;
F. insert reinforcing bar: poured into after bar planting clay, with being about to ready reinforcing bar, slowly rotating to inject and noted in the hole of clay, till being inserted into the anchorage length that meets reinforcing bar, immediately reinforcing bar is carried under rotation number up and down, discharge bubble, guarantee that hole reinforcement planting glue is full, simultaneously that the clay overflowing is full by the shutoff of position, aperture;
G. adjust: after steel tie is inserted, as needed, adjust reinforcing bar angle, should in short-term, adjust, during adjustment, do not allow reinforcing bar to be pulled outwardly;
H. maintenance: in reinforcing bar patchhole lower 24 hours of normal temperature with interior must not disturbance, otherwise will affect the anchoring strength of steel tie;
I. drawing detects: reinforcing bar has been planted after maintenance finishes, and should carry out the random drawing detection in scene.
A described a kind of clump of piles changes the construction of post enlarging basement, it is characterized in that step 5) basement bottom board to build step as follows:
A. base plate steel bar binding: along one 300mm of stake bottom perimeter setting * 600mm annular grade beam, first colligation is beam steel circlewise, the annular bar planting Φ 12 200 at the stake end carries out colligation with the main muscle of annular grade beam and is connected, then colligation baseplate reinforcing bar, the vertical reinforcement that pile body surface reinforces use inserts in annular grade beam, and vertical reinforcement top is done preliminary fixing;
B. build underplate concrete: by constructure scheme requirement blockette, water and smash underplate concrete.
A described a kind of clump of piles changes the construction of post enlarging basement, it is characterized in that the reinforcing step of the castinplace pile pile body described in step 6) is as follows:
A. pile body surface reinforced steel colligation, press designing requirement along the vertical main muscle of pile body periphery colligation and ring-shaped stirrup, vertical main muscle middle part is connected and fixed with the bar planting on pile body, the bar planting of vertical Zhu Jin top and original cushion cap bottom overlaps colligation and fixes, and the annular bar planting of vertical Zhu Jin bottom and pile foundation is connected and fixed;
B. pile body surface reinforcing template adopts circular arc wooden model to install;
C. reinforced concrete strength grade in pile body surface adopts C35, mixes 8%HEA micro-expanding agent in concrete.Because stake top is original cushion cap, therefore concrete vibrating is closely knit difficult when pile body radius strengthens 200 ㎜, therefore stay tubaeform the watering of 200 * 200 to smash mouth, so that concrete pours into and vibrates, until filling, concrete overflows.
A described a kind of clump of piles changes the construction of post enlarging basement, the bar planting implantation depth that it is characterized in that stirrup, lacing wire, plate muscle in the chemically-planted steel bar described in step 3) is 23d, at the bottom of beam, the reinforcing steel implant degree of depth is 25d, implantation bar diameter is different, bore diameter is also different, and aperture is generally D=d+ (4-10) mm.
A described a kind of clump of piles changes the construction of post enlarging basement, it is characterized in that bar planting agent and water described in step 3) are bar planting agent: water=1:0.15-0.20 by certain quality proportioning, described bar planting agent is the agent of injecting type anchorage inserted bar, a kind of bi-component, does not contain the new macromolecule polymeric material of environment-friendly type of any volatile toxic substance.
A described a kind of clump of piles changes the construction of post enlarging basement, it is characterized in that the according to claim 1 non-Anti-Seismic Region clump of piles described in step 3) changes post enlarging basement construction engineering method, collar tie beam described in it is characterized in that is set up collar tie beam for the pillar surrounding above pile cap, and cross section is 250 * 750MM.
By adopting above-mentioned technology, beneficial effect of the present invention is as follows:
1) directly utilize at the additional one deck back-up coat of castinplace pile as insulated column, rationally utilize the vertical bearing capacity of existing stake, do not need to increase in addition load-bearing pillar, work efficiency improves, cost saving, and the duration shortens greatly;
2) in protection original building looks, exploitation urban underground space, meets the user demand newly increasing, and has social benefit widely;
3) the method and reverse construction are similar, the post (existing stake transformation), the beam (original grade beam) that are equivalent to basement have been constructed, then carry out soil excavation, then do basement bottom board, perimeter walls, be finally basement roof, the duration shortens greatly;
4) cost aspect: can separately add one deck basement in the situation that not removing original building, save top-out dismounting, reconstruction expenses, utilize original grade beam to be used as the lateral stability bearing between stake, and basement not considered Anti-floating design, cost saving.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1-basement roof, 2-cushion cap, 3-castinplace pile, 4-pile body back-up coat, 5-basement bottom board, 6-annular grade beam, 7-fender pier.
The specific embodiment
Below in conjunction with Figure of description and embodiment, the invention will be further described:
As shown in Figure 1, an a kind of clump of piles changes post enlarging basement, the area of grade≤6 grade is applicable to provide fortification against earthquakes, wish enlarging increases the engineering that basement requires again top-out moulding not change, in basement soil layer of living in, there is no a large amount of Soft Soil Layers and mud, existing end bearing pile changes insulated column into and uses, existing stake is heavy caliber borehole perfusion end bearing pile, pile length is in 7m, weathering lithosphere >=1m during stake end embeds, pile spacing in 9.6m, applicable this engineering method when rear newly-increased or enlarging basement is excavated to by inter-pile soil side.Described basement comprises basement bottom board 5, the castinplace pile 3 being fixedly connected with basement bottom board 5, described castinplace pile 3 tops are equipped with cushion cap 2, castinplace pile 3 bottom peripheries are equipped with annular grade beam 6 and fender pier 7, described basement roof 1 is fixedly installed between the castinplace pile 3 described in cushion cap 2 and builds formation body of wall, in order to strengthen firmness, described castinplace pile 3 outsides are equipped with pile body back-up coat 4.
A clump of piles of the present invention changes the construction of post enlarging basement, do not destroying under the prerequisite of upper body structure, soil excavation between big caliber inserted rock end bearing pile in basis is fallen, form a underground space, the bottom of pile foundation increases fender pier, fender pier height >=1m, keeps single pile bottom stability; Between footing and footing, by basement bottom board, be connected, the high annular grade beam of 600 ㎜ is set up along stake periphery in base plate Yu Zhuan junction, and arrangement of reinforcement strengthens, and guarantees the resistance to overturning of clump of piles bottom; Existing embedding rock end bearing pile changes insulated column into and uses rear reinforcement ratio not enough, after adding the soil excavation between stake, cause that the vertical stability of single pile is inadequate, therefore stake surface is cut after finishing, pile body radius strengthens 200 ㎜ and sets up vertical main muscle and ring-shaped stirrup, increases single pile and changes vertical bearing capacity and the stability after post.
Concrete construction is as follows: soil excavation and slope retaining → end bearing pile removing surface finishing → stake and the construction of build → basement bottom board of cushion cap surface chemistry bar planting → basement bottom board bed course construction → pile body reinforcing → side fascia construction → basement roof.
1) soil excavation and slope retaining: soil excavation is the crucial first step, building safety in order to ensure the stage of shoveling, according to constructure scheme requirement, when basement area is larger, carry out blockette shoveling, after the basement bottom board of the first block has been built, after stability at the bottom of making is guaranteed, the earthwork that can excavate the second block.Stake is born responsibility and by former grade beam, is socketed between platform, can keep stable, and whole excavation is first indoor rear outdoor, and by the parallel propelling of a side direction opposite side, before excavation, original building place opens two above muck haulage passages.Because the indoor local clear height of one deck is less than 3 meters, directly by large digging machine and dump truck outward transport clear height, cannot meet the demands, adopt little digging machine shoveling, entrucking, small agricultural vehicle is transported to mound field, building west side, high with forklift heap, because little digging machine cannot once dig to design elevation, adopt two or three little digging machines upwards to turn native way, be transported to outdoor rear large forklift or large digging machine dress soil, with the direct outer spoil ground that is transported to of dump truck, after treating that indoor soil excavation is good, outdoor section is directly with large digging machine shoveling dump truck outward transport; Little digging machine and artificial clear soil for 50cm is stayed on shoveling Wa Zhiliang Bian,Zhu Bian,Zhuan limit and other inhering architecture limits, when machinery is cut the earth, controls at any time digging depth, is strictly on guard against and backbreaks, and should excavate according to soil property situation staged and layered.As run into special circumstances and should stop immediately excavation, can excavate after taking out processing scheme wait ascertaining the reason.Foundation bottom digging depth is inconsistent, during excavation, should perform at any time corresponding sign, with shoveling progress, by quality owner, control hole shoveling physical dimension, shape, the absolute altitude at the end, complex region be take and manually cut the earth as main, crisscross especially grade beam place, foundation ditch base fabric is put mao bamboon stake elevation control, measures at any time substrate absolute altitude in shoveling process, forbids to backbreak.Soil excavation is established collecting gutter and the pipe well that catchments in foundation ditch, with submersible pump, ponding is discharged to foundation ditch.Whole foundation trench is established open drain around, prevents that the surface water from flowing in foundation ditch.At the bottom of the fender pier of stake bottom, dig to weathered rock in 3-2, and enter apoplexy scar 200 ㎜, decomposed rock 500 ㎜ during outer wall of basement bottom embeds, adopt hammer drill to cut during dig on a wide area, and a small amount of finishing adopts pneumatic pick manual amendment.After the peripheral soil excavation of basement, need to carry out in time the supporting of excavation slope, guarantee the safety of inside processing personnel's safety during basement construction and the adjacent architectural of Around Buildings, road, ancillary facility.The peripheral foundation ditch of basement top does not allow to stack the earthwork and weight.
2) castinplace pile end bearing pile removing surface finishing: after soil excavation, the surface irregularity of original castinplace pile exposed parts, be stained with other foreign material such as earth, sandstone, the diameter of original filling pile construction moulding is larger than design stake footpath, and the verticality of stake also has deviation, so need to clear up foreign material to pile body surface, and the evagination concrete on pile body surface, honeycomb and loosening concrete are carried out to artificial chisel and remove, the diameter of pile body, verticality are trimmed, make it meet design and code requirement.
3) castinplace pile and the bar planting of cushion cap surface chemistry: according to designing requirement, between the main muscle of pile body thickened portion and stake, cushion cap, stake with base plate, fender pier between all adopt the method for chemically-planted steel bar to be effectively connected, therefore the quality influence that the quality of chemically-planted steel bar changes post to stake is very large, must be controlled by emphasis.
A. chemically-planted steel bar technological process: unwrapping wire is located → holed →Qing hole → reinforcing bar and processes → join glue, perfusion bar planting agent → insertion reinforcing bar → adjustment → curing conservation → detection.
B. unwrapping wire is located: according to design drawing, require to emit bar planting position line at pile body and cushion cap surface, position, hole unwrapping wire will be dodged main muscle in original structure, in order to avoid injury of primary structure reinforcing bars, unwrapping wire will accurately require construction according to design drawing, when original structure and drawing are not inconsistent, make a record and notify designer, to change or advise, if any special, should do suitable adjustment according to field condition.
C. boring: hole is got to the degree of depth of designing requirement with hand electric drill or platform drill on the position of indicating.Reinforcing bar implantation depth is generally 23-25d(d by being planted bar diameter), the bar planting implantation depth of stirrup, lacing wire, plate muscle is 23d, and at the bottom of beam, the reinforcing steel implant degree of depth is 25d, and all the other bar planting degree of depth are 23d.Implantation bar diameter is different, and bore diameter is also different, and aperture is generally D=d+ (4-10) mm, and minor diameter mechanical erection is got lower bound, and major diameter perfusion is installed and got high limit.Electric drill can use desk-top or portable, the advantage of platform drill be durable, strength is large, penetration rate is fast, good stability, but equipment cost is too expensive, is applicable to the bar planting that engineering quantity is larger; Hand electric drill advantage be carry, easy to use, but when operation is more tiring, and equipment shaking amplitude compare great ， Kong position is prone to deviation during boring, is applicable to the bar planting that engineering quantity is less.
D.Qing hole: according to the difference of bar planting agent kind, bar planting hole hole wall requires also different, divides moistening and dry.Some bar planting agent require by hole accomplish fluently rear first with hairbrush by floating dust outwash, then with balloon, floating dust is blown off, and cleans up with acetone, foreign material in cleaning hole after some bar planting agent require to hole, with the moistening hole of clear water, before bar planting, remove open fire in hole, but should guarantee the moistening of hole wall.Finally check hole depth, aperture, qualified rear with staple by aperture temporary enclosed, in case other impurity enters in hole.
E. reinforcing bar is processed: the greasy dirt of anchorage length of steel bar scope is clean by solvent clean, method is to dip in special purpose detergent wiping reinforcing bar until without greasy dirt sense (if there is) with clean degreasing staple, if any iron rust (the cyan crust suggestion of new reinforcing bar is also removed), with angle grinding machine, joining wire brush removes, until expose the new face of reinforcing bar, after handling, according to different-diameter, length, unification is stacked.
F. pour into bar planting clay: by the requirement of bar planting agent description, (be generally bar planting agent: water=1:0.15-0.20), stir into uniform clay (grasp denseness, slightly thick be convenient to insert solid reinforcing bar) by bar planting agent and water are deployed according to a certain percentage.With PVC plastic pipe or conduit, by clay ingress pipe, and send in hole, then with another bar, clay in pipe is squeezed in eyelet; The amount of injecting for there being a small amount of glue that overflows to be advisable when reinforcing bar inserts.Before use, should check the relevant quality certificates materials such as date of manufacture, the quality certification of bar planting agent, must not use " three without " product and expired product, to guarantee the quality of bar planting.The performance such as that bar planting Anchor Agent generally has is water-fast, ageing-resistant, moisture resistance is good, but the material of different boards its hardening time, range of application are different, hardening time is also different, and some anchoring adhesives can be at rapid curing under wet environment, and what have must work under normal natural environment.Concrete condition will be according to job site actual conditions fixed and products instruction determine, can not blindly use, also different glue must not be mixed and uses.Generally from bar planting Anchor Agent, adding water, to play reinforcement installation good, should in 40 minutes, complete.
G. insert reinforcing bar: poured into after bar planting clay, with being about to ready reinforcing bar, slowly rotating to inject and noted in the hole of clay, till being inserted into the anchorage length that meets reinforcing bar, immediately reinforcing bar is carried under rotation number up and down, discharge bubble, guarantee that hole reinforcement planting glue is full, simultaneously that the clay overflowing is full by the shutoff of position, aperture.
H. adjust: after steel tie is inserted, as needed, adjust reinforcing bar angle, should in short-term, adjust, during adjustment, do not allow reinforcing bar to be pulled outwardly.
I. maintenance: in reinforcing bar patchhole lower 24 hours of normal temperature with interior must not disturbance, otherwise will affect the anchoring strength of steel tie; Drawing detects: reinforcing bar has been planted after maintenance finishes, should carry out the random drawing in scene and detect, pull-out test result require reinforcing bar tension load be greater than this reinforcing bar design pull strength and reinforcing bar non-loosening, without the metaboly as seen such as slippage.
4) basement bottom board bed course is built: after foundation ditch digs, check in time substrate absolute altitude, finishing side slope width, then carries out test slot of foundation, can be by design thickness disturbing concrete bed course after check of foundation subsoil is qualified, and guarantee bed course absolute altitude; To under grade beam, turn over, cushion cap, sump etc. locate first to lay bricks or shuttering waters concrete and does end loose tool, should first powder cement mortar to brick loose tool, cushion layer concrete slump is controlled at 15cm, with plate vibrator jolt ramming, flattens.
Because the basement bottom board that this engineering method adopts is not considered buoyancy of water, draining after basement builds up adopts french drain, open drain to add the method draining of collecting well draining, weathered rocks 500 ㎜ during the basement wall embeds, between wallboard and basement rock, with C25 element concrete, tamp, prevent that outdoor water from infiltrating indoor, french drain can water and smash bottom cushion after carrying out.
5) basement bottom board construction: first colligation baseplate reinforcing bar, along stake bottom perimeter setting together 300 * 600 annular grade beams, first colligation is beam steel circlewise, the annular bar planting at the stake end
Φ12 200 carry out colligation with the main muscle of annular grade beam is connected, colligation baseplate reinforcing bar then, and the vertical reinforcement that pile body surface reinforces use inserts in annular grade beam, and vertical reinforcement top is done preliminary fixing; Third builds underplate concrete.By constructure scheme requirement blockette, water and smash underplate concrete, the thickness of slab of carrying out position, ater-casting is controlled and the measure such as mortar leakage prevention.
6) castinplace pile pile body is reinforced
A. surperficial reinforced steel colligation, press designing requirement along the vertical main muscle of pile body periphery colligation and ring-shaped stirrup, vertical main muscle middle part is connected and fixed with the bar planting on pile body, the bar planting of vertical Zhu Jin top and original cushion cap bottom overlaps colligation and fixes, and the annular bar planting of vertical Zhu Jin bottom and pile foundation is connected and fixed.Because pile body circular arc degree and verticality after finishing are not very desirable, therefore the ring-shaped stirrup on surface need, according to the independent moulding customized of the actual conditions of each, make the external protection of vertical main muscle can keep as far as possible even;
B. surperficial reinforcing template adopts circular arc wooden model to install, and 8# galvanized wire banding for template outside, prevents swollen mould,
Template bottom and the cement mortar shutoff of base plate junction, prevent bottom spillage;
C. surperficial reinforced concrete strength grade adopts C35, mixes 8%HEA micro-expanding agent in concrete.Because stake top is original cushion cap, therefore concrete vibrating is closely knit difficult when pile body radius strengthens 200 ㎜, therefore when pile body top outer formwork, top respectively stays tubaeform the watering of 200 * 200 to smash mouth in former cushion cap four sides, so that concrete pours into and vibrates, until filling, concrete overflows, more than watering the concrete absolute altitude of smashing mouthful place absolute altitude exceeding 50 ㎜ at the bottom of than former cushion cap, for guaranteeing concrete density, before final set, to watering, smash mouthful place's concrete and carry out secondary vibration.
7) outer wall of basement construction: the bar planting on designing requirement outer wall of basement reinforcing bar and pile body is connected and fixed, the bar planting of vertical Zhu Jin top and original cushion cap bottom overlaps colligation and fixes, and the annular bar planting of vertical Zhu Jin bottom and pile foundation is connected and fixed.Outer wall of basement is filled out embedding with the surperficial junction of stake with sponge, reduces the spillage at this position.The watering to smash by normal construction requirement of walls concrete controlled.
8) lower chamber top board construction: minute newly-increased beam in basement top is positioned on former cushion cap surface, for guaranteeing the stability of newly-increased basement roof beam, pillar surrounding above former cushion cap is set up 250 * 750 collar tie beam, divide the newly-increased beam in basement top and former cushion cap or former beam, post to join, need to be connected by the method for chemically-planted steel bar, new-old concrete interface wants dabbing to process, and is beneficial to the bonding of new-old concrete.
Example Yi Fu ACE Semi square basement extension project, mainly be divided into two parts, inhering architecture Xi,Nan, north side is newly-built B1, in inhering architecture, increase B1 market, existing end bearing pile changes insulated column into and uses, indoor basement floor height is 5.10m, outdoor basement floor height 4.65m.Building area is 10000 ㎡.Architectural design service life is 50 years; Fire resistance rating is one-level; Seismic fortification intensity is six degree.Structure types is concrete frame structure.Newly-built basement adopts reinforced concrete independent foundation, does not consider anti-floating at the bottom of plate, and essential bearing stratum is 3-2 layer medium weathering siltstone.Strength grade of concrete: basement bed course C15; Constructional column, collar tie beam, lintel are C25; Base plate, side fascia are the impervious concrete of C30, and impervious grade is P8, and top board is C35, and pile body reinforced concrete is C35.This basement extension project went into operation on May 11st, 2008, and steel concrete main structural engineering completes approximately 100 days durations; The all-work finishing target date is on September 17th, 2008.
Claims (7)
1. a clump of piles changes the construction that post is extended basement, described basement comprises basement bottom board (5), the castinplace pile (3) being fixedly connected with basement bottom board (5), described castinplace pile (3) top is equipped with cushion cap (2), castinplace pile (3) bottom periphery is equipped with annular grade beam (6) and fender pier (7), described basement roof (1) is fixedly installed between the described castinplace pile (3) of cushion cap (2) and builds formation body of wall, described castinplace pile (3) outside is equipped with pile body back-up coat (4), it is characterized in that described construction comprises the following steps:
1) soil excavation and slope retaining: according to constructure scheme requirement, when basement area is larger, carry out blockette shoveling, after the basement bottom board of the first block has been built, after the stability at the bottom of making is guaranteed, the earthwork that can excavate the second block;
2) castinplace pile (3) removing surface finishing: after soil excavation, the evagination concrete on pile body surface, honeycomb and loosening concrete are carried out to artificial chisel and remove, design and code requirement trim the diameter of pile body, verticality;
3) castinplace pile (3) and cushion cap (2) surface chemistry bar planting, by following technological process, carry out chemically-planted steel bar:
Unwrapping wire is located → is holed →Qing hole → reinforcing bar and processes → join glue, perfusion bar planting agent → insertion reinforcing bar → adjustment → curing conservation → detection;
4) basement bottom board bed course is built: with concreting one deck basement bottom board bed course, the C10 concrete bed course that its thickness is 100mm;
5) building of basement bottom board (5): the good baseplate reinforcing bar of first colligation, then build underplate concrete;
6) reinforcing of castinplace pile (3) pile body, adds one deck pile body back-up coat (4) at the external surface of castinplace pile (3);
7) basement wall body construction: be connected and fixed by the bar planting on designing requirement outer wall of basement reinforcing bar and castinplace pile (3) pile body, the bar planting of vertical Zhu Jin top and original cushion cap bottom overlaps colligation and fixes, the annular bar planting of vertical Zhu Jin bottom and pile foundation is connected and fixed, outer wall of basement is filled out embedding with the surperficial junction of stake with sponge, reduce the spillage at this position, then carry out watering of walls concrete and smash;
8) basement roof (1) construction: be positioned on former cushion cap surface by the newly-increased beam in drawing part basement top, pillar surrounding above former cushion cap is set up collar tie beam, the newly-increased beam in another part basement top and former cushion cap or former beam, post join, method by chemically-planted steel bar is connected, new-old concrete interface carries out dabbing processing, obtains a clump of piles and changes post enlarging basement;
Chemically-planted steel bar technological process described in step 3) is as follows:
A. unwrapping wire is located: according to design drawing, require to emit bar planting position line at pile body and cushion cap surface, position, hole unwrapping wire will be dodged main muscle in original structure, in order to avoid injury of primary structure reinforcing bars, unwrapping wire will accurately require construction according to design drawing;
B. boring: hole is got to the degree of depth of designing requirement with hand electric drill or platform drill on the position of indicating, reinforcing bar implantation depth is generally 23d-25d, and described d is by being planted bar diameter;
C.Qing hole: the powder to the inside, hole is removed;
D. reinforcing bar is processed: the greasy dirt of anchorage length of steel bar scope is clean by solvent clean, until expose the new face of reinforcing bar, after handling, according to different-diameter, length, unified stacking is standby;
E. pour into bar planting clay: use PVC plastic pipe or conduit by clay ingress pipe, and send in hole, then with another bar, clay in pipe is squeezed in eyelet;
F. insert reinforcing bar: poured into after bar planting clay, with being about to ready reinforcing bar, slowly rotating to inject and noted in the hole of clay, till being inserted into the anchorage length that meets reinforcing bar, immediately reinforcing bar is carried under rotation number up and down, discharge bubble, guarantee that hole reinforcement planting glue is full, simultaneously that the clay overflowing is full by the shutoff of position, aperture;
G. adjust: after steel tie is inserted, as needed, adjust reinforcing bar angle, should in short-term, adjust, during adjustment, do not allow reinforcing bar to be pulled outwardly;
H. maintenance: in reinforcing bar patchhole lower 24 hours of normal temperature with interior must not disturbance, otherwise will affect the anchoring strength of steel tie;
I. drawing detects: reinforcing bar has been planted after maintenance finishes, and should carry out the random drawing detection in scene.
2. an a kind of clump of piles according to claim 1 changes the construction of post enlarging basement, it is characterized in that the sequence of excavation described in step 1) is: first indoor rear outdoor, by the parallel propelling of a side direction opposite side, before excavation, original building place opens two above muck haulage passages, adopt little digging machine shoveling, entrucking, small agricultural vehicle is transported to mound field, building west side, high with forklift heap, be transported to outdoor rear large forklift or large digging machine dress soil, with the direct outer spoil ground that is transported to of dump truck, after treating that indoor soil excavation is good, outdoor section is directly with large digging machine shoveling dump truck outward transport; Little digging machine and artificial clear soil for 50cm is stayed on shoveling Zhi Liang Bian,Zhu Bian,Zhuan limit and other inhering architecture limits.
3. an a kind of clump of piles according to claim 1 changes the construction of post enlarging basement, it is characterized in that step 5) basement bottom board to build step as follows:
A. base plate steel bar binding: along one 300mm of stake bottom perimeter setting * 600mm annular grade beam, first colligation is beam steel circlewise, the annular bar planting Φ 12 200 at the stake end carries out colligation with the main muscle of annular grade beam and is connected, then colligation baseplate reinforcing bar, the vertical reinforcement that pile body surface reinforces use inserts in annular grade beam, and vertical reinforcement top is done preliminary fixing;
B. build underplate concrete: by constructure scheme requirement blockette, water and smash underplate concrete.
4. an a kind of clump of piles according to claim 1 changes the construction of post enlarging basement, it is characterized in that the reinforcing step of castinplace pile (3) pile body described in step 6) is as follows:
A. pile body surface reinforced steel colligation, press designing requirement along the vertical main muscle of pile body periphery colligation and ring-shaped stirrup, vertical main muscle middle part is connected and fixed with the bar planting on pile body, the bar planting of vertical Zhu Jin top and original cushion cap bottom overlaps colligation and fixes, and the annular bar planting of vertical Zhu Jin bottom and pile foundation is connected and fixed;
B. pile body surface reinforcing template adopts circular arc wooden model to install;
C. pile body surface reinforced concrete strength grade adopts C35, in in concrete, mix 8%HEA micro-expanding agent, because stake top is original cushion cap, therefore concrete vibrating is closely knit difficult when pile body radius strengthens 200 ㎜, therefore stay tubaeform the watering of 200 * 200, smash mouth, so that concrete pours into and vibrates, until filling, concrete overflows.
5. an a kind of clump of piles according to claim 1 changes the construction of post enlarging basement, the bar planting implantation depth that it is characterized in that stirrup, lacing wire, plate muscle in the chemically-planted steel bar described in step 3) is 23d, at the bottom of beam, the reinforcing steel implant degree of depth is 25d, implantation bar diameter is different, bore diameter is also different, and aperture is generally D=d+ (4-10) mm.
6. an a kind of clump of piles according to claim 1 changes the construction of post enlarging basement, it is characterized in that bar planting agent and the water described in step 3) is bar planting agent: water=1:0.15-0.20 by certain quality proportioning.
7. an a kind of clump of piles according to claim 1 changes the construction of post enlarging basement, it is characterized in that the according to claim 1 non-Anti-Seismic Region clump of piles described in step 3) changes post enlarging basement construction engineering method, collar tie beam described in it is characterized in that is set up collar tie beam for the pillar surrounding above pile cap, and cross section is 250 * 750MM.
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